Method of making bags



Aug. 17, 1937. A, PTD WN 2,090,308

METHOD OF MAKING 'BAGS Filed Nov. 20, 1934 INVENTOR Patented Aug. 17, 1937 UNITED STATES PATENT OFFICE METHOD or MAKING BAGS Adolph Potdevin, Garden City,

Potdevin Machine Company, Brooklyn,

N. Y., assignor to N.-Y.,

4 Claims.

In the accompanying drawing:

Fig. 1 is a plan view somewhat diagrammatic of an apparatus which may be employed for carrying out the method of my invention;

Fig. 2 is a side elevation of the apparatus of Fig. 1;

Figs. 3 and 4 show the bag in the various stages I of its manufactur Fig. 5 is a sectional view of the completed bag taken on line 5-5 of Fig. 6; and

Fig. 6 is a perspective view of the completed bag.

In carrying out my method I may proceed as follows: First I fold the edges of a traveling web over upon the body of the web to form side flanges, this step providing longitudinal creases adjacent the web edges. I then unfold these flanges and notch the web at opposite sides at spaced intervals.

Alternate pairs of opposed flanges are then folded inwardly again along the creases made in the first folding.

The web is then out along a transverse line adjacent one pair of opposed notches so as to provide sections substantially twice the length of a bag length and comprising two panels, the opposite sides of one of these panels being folded inwardly upon the body of the panel. Adhesive stripes are then applied to the face of one of the panels and the section is then folded along a transverse line about midway to bring the two portions of the section into parallelism with the folded flanges in engagement with the stripes of adhesive.

Longitudinal stripes of adhesive are then applied to the unfolded flanges and these flanges folded about the other panel and pasted thereto.

In the accompanying drawing I have illustrated an apparatus particularly well adapted for carrying out my method.

Referring to the drawing in detail: Material designated I is led past plates 2 which are adapted to fold the opposed edges of the web over toward each other upon the main body of the web to form flanges 3 at opposite sides of the web. 55 The web then passes between rollers 4 by which the flanges are turned outwardly again so that the web is once more flat.

In its flattened condition the web passes notching mechanism comprising notchers 5 and 6 at each side of the web adapted to notch the web as Shown at I and 8. The notchers 5 and 6 are mounted on the same shafts.

The notchers 5 and 6 are held to their-supporting shaft 9 by screws l0, so that the notchers may be adjusted relatively to each other to vary the spacing of the notches 1 and 8 lengthwise of the web to suit difierent conditions.

The web next passes between rocking fingers ll adapted to engage the opposite sides of the web, these fingers being so timed that the opposed edges of the web at One side of the opposed notches I will move under a plate l2 interposed in the path of the advancing web while the edges at the other side of the same notches will ride over the plate, which is so shaped as to turn these edges over upon the body of the web to form flanges as shown at l3.

The next step in the practice of my method comprises passing the web between rollers l4, past cutting off mechanism I5 and between rollers l6 and FL The cutting off mechanism shown in the drawing comprises a rotary'cutter bar l8 driven in the direction of the arrow on Fig. 1 cooperating with a fixed member IS. The function of this cutting off mechanism is to sever the main body of the web transversely, across opposed notches l but an appreciable distance to one side (to the right asyiewed in Fig. 1) of the. center of these notches so as to leave a relatively long flap designated 20 in Figs. 1, 3, and 5 on the trailing edge of the cut off portion and a relatively short flap 2| at the leading edge of the' adjacent section of material.

Each length of materiaLitherefore, is approximately double the length of the finished bag and as shown in Fig. 1 is composed of what I shall term two panels designated 22 and 23, respectively, the flanges l3 of the panel 22 being turned inwardly over upon the body of the web I as hereinbefore mentioned, while the flanges 3 on the panel 23 are in an opened up condition. The

i length of material as shown at 24 in Fig. 1 passes between rollers 25 and roller 26. The rollers 25 are the first paste applying rollers and receive paste from the roller 21 mounted in the paste pot v28. Longitudinal stripes of paste 29 are applied by the rollers 25 to the body of the panel 23 between the flanges 3.

The length of material shown at the left in 10 finger 33 may function to grip the material. Continued rotation of the roller 3| draws the material around with this roller and between the face of the roller and the face of a roller 36 lying adjacent thereto to fold the two panels of 15 the web over upon each other along the line 35 as illustrated in Fig. 4 thereby to bring the outer faces of the flanges |3 into contact with the paste stripes 29 on the panel 23, to paste the panel 22 on the panel 23.

In this condition the inner faces of the flanges 3 of the panel 23 are contacted with gluing discs 31 which apply adhesive thereto as shown at 38 in Fig. 4.

The folded material then passes between roll- 25 ers 39 and finally between a pair of superposed belts 40 where the flanges 3 of panel 23 are folded over upon the panel 22 as shown in Fig. 6, which completes the bag.

It will be noted from the sectional view of the bag shown in Fig. that the flanges I3 of the panel 22 are pasted to the body of panel 23 by means of the adhesive stripes 29 and that the flange 3 of the panel 23 is pasted to the body of the panel 22 by means of the adhesive stripes 38,

thereby providing a bag wherein the flanges 2 .or folded flaps forming the seams are reinforced. In other words the edges of the bag have twice the number of plies as either wall of the bag. In the bag illustrated the bag wall is single ply, the

40 edges of the bag being two-ply.

The claims of the present application are directed primarily to my improved method of making bags, the apparatus for making such bags constituting the subject matter of my copending 45 application Serial No. 753,821 filed November 20,

While I have illustrated and described one embodiment of my invention I do not wish to be 50 limited to the practice of my method by the structure herein shown and described as obviously the various steps of my improved method may be carried out by modifications of the structure herein disclosed without departing from the spirit and 55 scope of my invention.

What I claim is:-

1. In the making of bags and the like the method which comprises forwarding a web of material, notching opposite sides of the traveling 60 web while the sides are in the same plane as the body of the web with alternate pairs of large and small notches, severing the web transversely from a large notch on one side of the web to the opposed large notch on the other side of the web, while maintaining the line of severance within the edges of said notches, thereby to provide a section of material having a pair of opposed notches substantially midway of the section and a flap at each end of said section.

2. In the making of bags and the like the method which comprises forwarding a web of material, notching opposite sides of the traveling web while the sides are in the same plane as the body of the web with alternate pairs of large and small notches, severing the web transversely from a large notch on one side of the web to the opposed large notch on the other side of the web, while maintaining the line of severance within the edges of said notches, thereby to provide a section of material having a pair of opposed notches substantially midway of the section and a flap at each end of said section and folding the section along a transverse line adjacent said midway notches to bring the portions of the section into parallelism.

3. The method of making bags which comprises forwarding a web of material, notching the opposed sides of the traveling web at predetermined intervals while the sides are in the same plane as the body of the web to provide alternate pairs of large and small notches, severing the web transversely substantially midway of the larger notches from the large notch on one side of the Web to the opposed large notch on the other side of the web, while maintaining the line of severance within the edges of said notches, thereby to provide a bag length with a pair of opposed notches intermediate its ends and an end flap in each wall, folding over the side edges of that portion of the bag length which eventually is to constitute one wall of the bag and is to one side of the intermediate notches along a longitudinal line adjacent each edge of said portion of the I bag length, then folding the bag length along a transverse line which intersects said intermediate notches and pasting the said folded edges to the body portion of the web which is to constitute the other wall of the bag.

4. The method of making bags which comprises forwarding a web of material, notching the opposed sides of the traveling web at predetermined intervals while the sides are in the same plane as the body of the web toprovide alternate large and small notches, severing the web transversely into bag lengths at a point to.one side of the center line of the larger pair of notches, while maintaining the line of severance within the edges of said notches, thereby to provide a bag length with a pair of opposed notches intermediate its ends and a, large flap at one end and a smaller flap at the other end, folding over the side edges of that portion of the bag length which eventually is to constitute one wall of the bag and is to one side vof the intermediate notches along a, longitudinal line adjacent each edge of said portion of the has length, then folding the bag length along a transverse line which intersects said intermediate notches and pasting said folded edges to the body portion of the web which is to constitute the other wall of the bag and folding the side edges of the last-mentioned portion about the edges of the other portion and pasting the same thereto.

ADOLPH PO'IDEVIN. 

